Donald Trump has reportedly given the Pentagon permission to carry out more raids in Yemen – despite a botched mission in January that resulted in the deaths of 20 civilians and a US Navy Seal.

The White House told military leaders they can carry out missions in the Gulf state without specific presidential approval.

Negotiations about extending similar permissions to raids in Libya and Somalia are also taking place, CNN reported.

Instead of needing Mr Trump to sign off on specific missions, officials told the broadcaster that military leaders will be given the freedom to carry out operations providing they are in line with a broader strategy agreed by the President.

US Navy Captain Jeff Davis said the White House had acted to "open up a window of opportunity based upon a set geographical area and a set period in time".

As a result of the change, 40 US airstrikes have been launched in Yemen in the last two weeks.

President Donald Trump is proposing historically deep budget cuts that would touch almost every federal agency and program and dramatically reorder government priorities to boost defense and security spending, although it’s likely to face a fight in Congress.

The president’s fiscal 2018 budget request, which will be formally delivered Thursday to U.S. lawmakers, would slash or eliminate many of the Great Society programs that Republicans have for decades tried to peel back while showering the Pentagon and Department of Homeland Security with new resources.

On Thursday, Trump laid out plans for a military buildup in his first budget request, while asking Congress for $30 billion in extra funds for the military this year. That would include money to "accelerate the campaign to defeat the Islamic State of Iraq and Syria," he wrote in his message to Congress.

The acceleration is already underway.

In recent weeks the Pentagon, at the request of Army Lt. Gen. Stephen Townsend, the top commander in Baghdad, has quietly inserted hundreds of conventional troops into Syria to aid preparations to retake Raqqa, the capital of the Islamic State's self-declared caliphate.

They join at least 500 American troops already inside Syria and more than 5,000 American military advisers, trainers and attack helicopter crews in Iraq, where Iraqi forces are waging an intense fight to retake the northern city of Mosul.

The moves mark an escalation in the three-year-old campaign to dislodge the Islamic State from large swaths of its territory.

The Pentagon is also considering sending several thousands of additional troops to Kuwait as what one military official with direct knowledge described as a "reserve" force for the anti-ISIS fight in Iraq and Syria. And a stepped-up U.S. bombing campaign in recent weeks against al Qaeda in Yemen is raising further questions about deeper involvement in that country's civil war, while the commander in Afghanistan recently telegraphed that he will seek more forces — on top of 8,400 already there — to beat back a Taliban resurgence.